my·self 
/maɪˈsɛlf/ pronoun
/maɪˈsɛlf/ pronoun 1 : the person who is speaking or writing: a — used as the object of a verb or preposition to refer to yourself after you have already been mentioned ▪ I accidentally cut myself while cooking. ▪ I'm going to get myself a new car. ▪ I bought myself a new suit. ▪ I consider myself to be a pretty good swimmer. ▪ I had to ask myself if this was what I truly wanted. ▪ I reminded myself that this is just a game. ▪ I told a bad joke and made myself look foolish. ▪ I am proud of myself for finishing college. ▪ I could no longer keep the secret to myself. ▪ I'm doing this for myself. [=for my own benefit] ▪ I said to myself, “Here's a man who knows what he's doing.” ▪ I had the house (all) to myself. [=I was alone in the house] ▪ I wanted to see it for myself. [=to see it rather than have someone tell me about it, describe it to me, etc.]
b — used for emphasis to refer again to yourself after you have already been mentioned ▪ I told him so myself. ▪ If you won't go, then I'll go myself. ▪ I myself have never been to Italy. ▪ I myself have experienced the same thing. 2 : my normal or healthy self
▪ I was nervous and uncomfortable and just didn't feel (like) myself. ▪ I'm not feeling (like) myself today. I think I may be coming down with a cold. ▪ I'm not myself today. I just don't feel right. ▪ I find it hard to be myself [=to relax and behave in my usual way] when I'm with people I don't know well.
b — used for emphasis to refer again to yourself after you have already been mentioned ▪ I told him so myself. ▪ If you won't go, then I'll go myself. ▪ I myself have never been to Italy. ▪ I myself have experienced the same thing.
▪ I was nervous and uncomfortable and just didn't feel (like) myself. ▪ I'm not feeling (like) myself today. I think I may be coming down with a cold. ▪ I'm not myself today. I just don't feel right. ▪ I find it hard to be myself [=to relax and behave in my usual way] when I'm with people I don't know well.
by myself 1 : without any help from other people
▪ I can't do it (all) by myself. ▪ It's hard to believe that I started this company by myself 20 years ago. 2 : with nobody else : alone
▪ I went to movies by myself. ▪ I had to play in my room (all) by myself.
▪ I can't do it (all) by myself. ▪ It's hard to believe that I started this company by myself 20 years ago.
▪ I went to movies by myself. ▪ I had to play in my room (all) by myself.
